How to Increase Milk Supply: Real Causes of Low Milk Supply, Common Myths, and Evidence-Based Solutions

Low milk supply is one of the most emotionally loaded concerns in breastfeeding — and knowing how to increase milk supply is one of the most searched questions Australian mothers ask. It is also one of the most commonly misunderstood. Research consistently finds that perceived low milk supply is one of the leading reasons Australian mothers stop breastfeeding earlier than they intended — and that in many of those cases, supply is not actually the problem.

That does not mean low milk supply is never real. It is, for some mothers. But distinguishing between genuine supply insufficiency and perceived supply concerns — and understanding what actually drives each — is essential before reaching for any solution.

This article focuses specifically on causes, myths, and solutions. It does not cover how to tell if your supply is genuinely low — that question is answered in depth in a companion article. This one starts from the point where you already have concerns and want to understand what might be behind them and what can realistically be done.

This article is part of the Nella Vosk Breastfeeding Nutrition & Milk Supply: Evidence-Based Guide for Australian Mothers — your comprehensive resource for the full feeding journey.

At Nella Vosk, milk supply support is central to our Milk & Feeding Support pathway — because when a mother feels confident about her supply, the entire breastfeeding experience changes.

Before diving into causes and myths, a brief grounding in how milk production is regulated is useful, because it explains both why most supply issues are addressable and why some are not.

Milk production is governed by the supply-and-demand principle, driven by two hormones: prolactin (which drives milk synthesis) and oxytocin (which triggers milk release at let-down). The key regulatory mechanism is milk removal: when milk is removed from the breast frequently and effectively, the brain receives the signal to produce more. When milk remains in the breast for extended periods, a protein called Feedback Inhibitor of Lactation (FIL) accumulates and tells the body to slow production.

This means that in most cases, the most powerful lever for milk supply is how often and how completely the breasts are drained — not diet, not supplements, not stress levels in isolation. Understanding this is not meant to minimise other factors, which genuinely do matter. It is meant to establish the right starting point: supply is primarily a demand-signal problem, and addressing demand is the first intervention.

Low milk supply falls into two broad categories: secondary (by far the most common, driven by management and feeding practices) and primary (driven by physiological or medical factors, which are less common but real and important to acknowledge).

Secondary low milk supply means the glandular tissue is present and capable of producing milk, but something is interfering with the demand signal or with milk removal. These causes are often entirely addressable once identified.

Infrequent or ineffective feeding

This is the most common driver of true secondary low milk supply. If a baby is not feeding frequently enough, or is not draining the breast effectively, prolactin stimulus falls and production decreases to match. Causes include a shallow latch (the baby suckles but does not drain milk efficiently), feeding to a schedule rather than on demand in the early weeks, and a sleepy or unwell baby who does not cue to feed often enough.

The Australian Breastfeeding Association recommends that newborns feed 8 to 12 times in 24 hours in the early weeks. Many mothers find this frequency surprising, but it reflects the actual demand required to establish a robust supply.

Supplementation and dummy use before supply is established

Introducing formula top-ups or a dummy in the early weeks reduces time at the breast. Less time at the breast means less demand signalling, which means less milk production. This can create a self-fulfilling prophecy: the mother supplements because she is worried about supply, which reduces supply, which confirms the worry.

This is not to say supplementation is never appropriate — there are circumstances where it is genuinely necessary. But well-intentioned supplementation in the absence of a genuine medical need can undermine supply before it is established.

Nipple pain and latch issues

A mother in significant pain at every feed will naturally shorten feeds or reduce frequency. Pain is also a stress signal that can inhibit let-down. And a baby with a poor latch is not effectively stimulating the breast even when feeding appears to be happening. If nipple pain is present, addressing it through a lactation consultant is both a comfort intervention and a supply intervention.

Returning to work or long separations

When a mother is separated from her baby and is not pumping at the frequency the baby would feed, demand signalling drops. Milk supply adjusts to the new, lower stimulation level within days. This is one of the most common causes of a breast milk supply drop in the second and third months.

Stress, poor nutrition, and dehydration

Chronic stress elevates cortisol, which can suppress oxytocin and impair let-down — making it harder for milk to flow efficiently even when production is adequate. Severe caloric restriction reduces milk volume. Dehydration affects milk composition and, in significant cases, volume. These are real but often secondary factors — they can compound a supply concern but are rarely the sole cause of low supply on their own.

These are the most persistent and damaging myths around milk supply — persistent because they feel intuitive, and damaging because they cause mothers to stop breastfeeding when supply is actually adequate.

Myth: Soft breasts mean low supply

In the first few weeks, breasts may feel firm and full because they are producing more milk than the baby needs while supply regulates. After four to six weeks, most mothers find their breasts feel softer and less full — this is normal and reflects supply adjusting to meet (rather than exceed) demand. Soft breasts are not a sign of low supply; they are a sign that breastfeeding is established.

Myth: A baby who feeds constantly must not be getting enough

Cluster feeding — where a baby feeds very frequently, sometimes for hours in the evening — is a normal developmental behaviour, particularly in the first three months. It is driven by growth spurts, developmental needs, and the baby’s instinct to drive up supply. It does not mean there is insufficient milk. Frequent feeding is the mechanism by which supply is increased, not a sign that supply is failing.

Myth: If you can’t express much with a pump, your supply is low

A pump is not a baby. Even the best hospital-grade pump is not as efficient as an effectively latched baby at removing milk. Many mothers with excellent supply pump very little, while some mothers with marginal supply pump more efficiently. Pump output is not a reliable measure of milk supply.

Myth: A baby who seems unsettled after feeds is still hungry

Baby unsettledness has many causes: wind, reflux, overtiredness, overstimulation, developmental changes, and normal newborn fussiness. Assuming unsettledness means hunger leads many mothers to supplement unnecessarily, which then reduces supply through the mechanism described above. Assessing actual milk intake through weight gain and nappy output is far more reliable than interpreting behaviour.

Myth: Only 5% of women can’t make enough milk

This widely repeated statistic has a contested origin and is not well-supported by more recent research. Studies suggest between 15% of first-time mothers experience true low supply in the early weeks. The important nuance is that the majority of these cases are secondary — addressable with the right support — rather than primary. The myth’s harm is not in its direction (most women can breastfeed) but in how it is sometimes used to dismiss mothers who are genuinely struggling: implying the problem is in their head rather than in their management or physiology.